Improvement in corrugating metallic sheets



' UNITED STATES PATENT OFFICE.

RlCHA-RD MONTGOMERY, OF NEW YORK, N. Y.

IMPROVEMENT IN CORRUGATING METALLIC SHEETS.

Specification forming part of Letters Patent No. 24,480, dated June 21,18,59.

.To all whom it may concern.-

Beit known that I, RICHARD MONTGOMERY, of the city, county, and State ofNew York, have invented an Improvement `in the Corrugated MetallicPlates or Sheets for Boilers, dac., patented to me on the 17th day ofMay, 1853; and I do hereby declare that the following is a full, clear,and exact description of 4the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,so as to' enable others Jskilled in the art to make and use my inven-Figure 1 represents a plan view of a corrugated plate with myimprovement added thereto. Fig. 2 represents a cross-section through theplate shown in Fig. 1, the s ection being taken on line a. b, Fig. l.Fig. 3 represents part 'of a iue made from plates manufactured on theprinciple of my invention.

From Fig. 2 it will be seen that the flanges are made thicker than thecorrugated portion of the plate, as provided for in my aforesaid patent,so as to airord suitable strength and form of metal for uniting thesheets.

My improvement will be readily understood from Figs. 1 and 2, where'itwill be seen the corrugat-ions A B are not straight, as in my formerpatent, but are waved so that each of the ribs A B of the corrugatedplates has a double curvature, one in'the direction of its length, asseen in Fig. 1, and

one across its width, as seen in Fig. 2. lt will also be seen that eachof these waved ribs or corrugations is longer than what a straight ribor corrugation would be. Consequently the surface of a plate providedwith waved corrugations is greater than the surface of a plate withstraighticorrugations, while at the same time the corrugations arecontinuous from side to side, so that when bent together the ends of thecorrugations will meet or be opposite to each other. Thus my waved andcorrugated plates for boilers oler a larger heating-surface than anyother plate of the same dimensions provided With straight corrugations.Again, these plates provided with doubly-curved continuous ribsA are farless liable to stretch in a direction across the ribs than plates whichhave straight continuous corrugations. Vhen the waved corrugations aresoarranged as to run in the direction of the flame, the heated gasesstriking one wave of the corrugations (the corrugations beingcontinuous) will be deflected and impinge against the wave of the nextcorrugation, &;c., as indicated by the arrow in Fig. 1, and thus theheated gases will be waving the corrugations so that each corrugationalong its whole length runs back and forth over various layers of fiberswhichever way the plate may be rolled. It will be understood that themetal may be so rolled as'to be thicker at the extreme points of thelateral waves than along the slopes or sides of the waves.

Having described my invention, what I claim, and desire to secure byLet-ters Patent as an improvement on the invention patented to me on the17th day of May, 1853,

The waved corrugated Wrought-metal plate for boilers, as hereindescribed, in combination with iiat margins Aof greater thickness thanits middle, substantially as described.

R. MONTGOMERY. Witnesses:

THos. H. DODGE, M. J. MONTGOMERY..

